The legendary Loreley has been living for centuries in a grotto beneath the river Rhein in Germany. Every night when the moon is full, she turns into a reptile-like creature craving for human blood. When one girl after another of a nearby boarding school is killed by her, a hunter named Sigurd is engaged to kill the monster.

Tony Kendallas Sigurd
Helga Linéas Lorelei
Silvia Tortosaas Elke Ackerman
Loreta Tovaras Martha (as Lolita Tovar)
José Thelmanas Carlo Donati (as Joseph Thelman)
Luis Indunias Mayor
Francisco Nietoas Blind Violinist
Betsabé Ruizas Bride-to-Be
Luis Barbooas Alberic